Russian and Japanese specialists discuss sewerage management system

15.05.2019

On 15 May, Vodokanal was visited by the delegation from Osaka, Japan, led by Tetsuya Hamada, Director of the Water Environment Department, Public Works Bureau, Osaka City, in the framework of cooperation and sharing of experience in wastewater treatment and sewerage.

The guests were received by A.N. Danilov, Acting Director General of Vodokanal, who thanked his colleagues from Japan for the efficient interaction under the Memorandum of Understanding signed in 2015 by the Committee for Energy and Engineering Support, SUE "Vodokanal of St. Petersburg" and Osaka City.

Vodokanal specialists presented the design of sewerage management system for St. Petersburg to their Japanese colleagues. The system should be implemented urgently for the following reasons: climate change leads to enhanced precipitation, which, in combination with the city development and urban densification, results in bigger wastewater volumes; more stringent requirements to environmental safety of sewerage systems and upgrading of penalties for environmental offenses; it is difficult to raise the wastewater system performance in the city by using traditional reconstruction methods: laying of bigger-diameter pipelines and backup collectors, and construction of service reservoirs.

The concept of sewerage management in St. Petersburg takes into account the rainfall irregularity and the impact of storm overflows on the sewerage performance, as well as individual characteristics of each sewer basin, providing basin-specific methods to assess rainwater discharge via storm overflows depending on the duration, intensity and frequency of rainfalls. The system uses the CIS "Precipitation" data in consideration of the water table and the water level in the city’s water bodies. Thanks to the system, flooding can be prevented, and the volume of wastewater discharge into the city’s water bodies can be reduced.

Osaka City faces similar problems. Due to the climate change, the amount of precipitation increases every year, and problems with storm water drainage occur because of irregular rainfalls in the city. Municipal service specialists recognize the need for continuous sewerage modernization and the implementation of new technologies.

At the meeting, both parties expressed their intention to extend the Memorandum and to continue the sharing of experience and collaboration with a view to find new effective solutions in the field of water supply and wastewater disposal. The addendum on the extension of the Memorandum will be signed in September 2019 during the next visit of the Osaka delegation to St. Petersburg.

On 16 May, the specialists from Osaka will visit the South-West Wastewater Treatment Plant to look at the wastewater treatment and sewage sludge incineration processes.

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